There can be various reasons why you can not see your donation. Maybe you donated anonymously by removing the mark from the checkbox “Show my name in public”. Or maybe you have donated on another level, e.g. for the organization and not for the project.
You receive a confirmation via E-Mail for every donation. If you did not receive that e-mail, something did not work out. Just try again.
If you are insecure, write us: E-Mail: firstname.lastname@example.org